The records of individual ecclesiastical parishes include registers of baptisms, marriages and burials, as well as records of the churchwardens and Parochial Church Councils, parish charities, schools, clubs and societies.
Parish records were deposited at the Clwyd Record Office, following an agreement of 1976 between the Church in Wales and the Welsh County Councils.
The ancient parish of Llangollen was divided into three parts : Llangollen Traean, Trefor Traean, and Glyn Traean.
Llangollen Traean contained the townships of Bachau, Cysylltau, Llangollen Abad, Llangollen Fawr, Llangollen Fechan, Feifod, Pengwern and Rhisgog.
Trefor Traean contained the townships of Cilmediw, Dinbren, Eglwysegl, Trefor Isaf and Trefor Uchaf.
Glyn Traean contained the townships of Cilcochwyn, Crogeniddon, Crogenwladus, Erwallo, Hafodgynfor, Nantygwryd, Pennant and Talygarth.
On 15 April 1848, the whole of Glyn Traean, together with the township of Cysylltau from Llangollen Traean, went to form the new parish of Pontfadog.
Cysylltau returned to Llangollen in 1870.
[Information taken from http://www.genuki.org.uk/big/wal/DEN/Llangollen/index.html (last accessed June 2015)]